QUINCY - Police are looking for a man who witnesses say tackled and robbed another man outside a 7-Eleven store on Franklin Street late Sunday night.

Capt. John Dougan said the victim told police he was walking out of the store with his girlfriend around 11:30 p.m. Sunday when another man jumped at him, hit him in the face and pushed him to the ground. The victim said the man grabbed two gold chains from around his neck and ran off with them.

The attacker was described as a dark-skinned man in his 20s wearing a black hooded sweatshirt. Witness told police they thought he was carrying a knife.